Methods and apparatus are provided for controlling wireless signal transmissions, wherein problematic symbol patterns are relocated to an erasure region of a data packet prior to erasure encoding and transmission. Relocating the problematic symbol patterns is done so that, when the resulting erasure codeword is punctured and transmitted, the problematic patterns are not transmitted. Yet, those patterns can be restored by the decoder at the receiving device using an erasure decoder in accordance with erasure decoding techniques, e.g., punctured low-density parity-check (LDPC) decoding techniques. In this manner, problematic symbol patterns that may be corrupting during transmission due to noise are removed (punctured) prior to transmission, then restored by the decoder during decoding.
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2. The device of claim 1, wherein the processor is further configured to erasure encode the modified packet by generating a low-density parity-check (LDPC) codeword.
3. The device of claim 2, wherein the processor is further configured to puncture the erasure region of the LDPC codeword before transmitting the erasure codeword.
4. The device of claim 1, wherein the processor is further configured to select the erasure region to correspond to a set of overprotected nodes within an H-matrix of an LDPC code.
6. The device of claim 1, wherein the processor is further configured to erasure encode the modified packet into the erasure codeword by generating a parity block codeword over a plurality of sub-block codewords corresponding to the modified packet.
7. The device of claim 6, wherein the processor is further configured to erasure encode the modified packet so that each sub-block codeword is a low-density parity-check (LDPC) codeword.
8. The device of claim 1, wherein the processor is further configured to identify the at least one symbol by identifying a problematic pattern in the at least one symbol that causes unintended erasures within transmitted messages.
10. The method of claim 9, wherein the modified packet is erasure encoded by generating a low-density parity-check (LDPC) codeword.
11. The method of claim 10, further comprising puncturing the erasure region of the LDPC codeword before transmitting the erasure codeword.
13. The method of claim 9, wherein the at least one symbol includes is a problematic pattern that causes unintended erasures within transmitted messages.
15. The device of claim 14, wherein the processor is further configured to receive the erasure codeword as a punctured low-density parity-check (LDPC) codeword.
17. The device of claim 14, wherein the processor is further configured to relocate the at least one relocated symbol to its initial location by overwriting any other patterns at the initial location.
18. The device of claim 14, wherein the processor is further configured to erasure decode the received codeword by decoding the received codeword as a parity block codeword over a plurality of sub-block codewords.
19. The device of claim 18, wherein each sub-block codeword is a low-density parity-check (LDPC) codeword.
20. The device of claim 14, wherein the at least one relocated symbol in the original packet of data includes a problematic pattern that causes unintended erasures within transmitted messages.
22. The method of claim 21, wherein the erasure codeword is a punctured low-density parity-check (LDPC) codeword.
24. The method of claim 21, wherein the at least one relocated symbol includes is a problematic pattern that causes unintended erasures within transmitted messages.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 14, 2021
June 6, 2023
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